Question about 2002 GMC Envoy

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Engine lopes while idling or idles erratically

The first time it did that, I replaced the spark plugs and still the same. Next thing I did is I replaced the the fuel filter and still the same.

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1.vacuum leak
2.leaking egr or plugged pcv valve
3.ignition components damp or damaged
4.faulty or incorrectly gapped spark plugs
5.faulty plug wires
6.faulty emmission components
7.air filtr clogged
8.leaking head gasket
9.timing chain or gears worn
first check air filter then check timing with a light make sure its steady if it bounces around the your chain/belt is needing replaced check your wires for frays or just replace them cause their 10 years old

Posted on Feb 10, 2009

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2 Answers

Why does idle fluctuate from 800 rpm to1500 rpm


this is what they call engine loping u need to take it to a mech for proper diagnostic,,, bu check first spark plugs and wires mostly culprit though is timing bad,,,, bad timimg gear/belt/chain which ever is in yours.

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The problem: 2001 mitsubishi galant es will not continue to run first start up in the morning


For idle issue,click the help links provided below :---

Bad miss at idle? http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html---------- Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html

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Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

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Low idle when cold out side?

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Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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intermittent engine failure while idle?

http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html

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Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.


To confirm the problem, the basic troubleshooting is required.


Click this link below and follow the troubleshooting:------

http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

---------

This will help.

Thanks.

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1 Answer

Rough idling/loping at idle it otherwise runs fine off idle.


1. Vacuum leakage Check throttle body and intake manifold for tightness. check all vacuum hoses.
2. Faulty fuel or pump or electrical.
3. Plugged PVC valve.
4. Air filter clogged
5. Leaking head gasket.
6. Camshaft lobs worn.
All of these porblems can cause lopes or erratic idle.

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2 Answers

Engine idles rough at red lights begins loping rpms drop to almost killing, then cycles back to normal, then repeats rough idle drop in rpms and loping, back and forth until I rev engine or take off


You could have a clogged fuel filter, if you haven't changed it in awhile. You could have a leak in the intake system somwhere also. When you slow down, you get less power to the engine. It may need spark plugs and wires as well, if in need for a tune up.

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My truck is a 1998 ford f250 4wd, 5.4l engine. I have been having some problems where at idle (like at a light) it will idle very erratic, and very low. I recently replaced my mass air flow sensor, my...


I would tell you to stop guessing and throwing parts on that you dont need. First have it scanned and see if there are any trouble codes. you need to replace the ALL the spark plugs, Use only Motorcraft or Autolite platinum spark plugs gapped properly. . Be careful as coils are a common weak item , and are about $95 each. the Idle Air Control (IAC) solenoids are common to go bad also (controls idle speed)

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This usually happens when the fuel pump is loosing pressure.

I will just advice you make a replacement on the fuel pump. It is located in the fuel tank beneath the back seat.

Be sure to consider the rating on the fuel pump when replacing.

Good luck and rate my solution.

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Car idles low then dies.


For you to figure out if the spark plug fires, you need to pull it out one by one while running. Make sure that you are wearing protective gloves for this one. Normally for spark plug issues the idle will be sort of erratic and fells as if the revs is slow to go up when teh gas is stepped on. For the oil, check for leaks around the engine and smoke at the exhaust. Oil may enter the combustion chamber and burn causing a dark or bluish smoke. Also check the coolant in your radiator if oil gets in. For these problems you need to replace some oil seals and some oil ring. The low idle can be caused by faulty wiring since you have an EFI engine. Check the connections if they are loose. Also check the fast idle control valve if you can adjust the idle or it may need cleaning

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